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A Head-up display (HUD) could be (de)activated in FlightGear with the h-key. To change the sharpeness, press Shift + H.

Functions

Aileron

 
Aileron

Altitude

 
Altitude

Current altitude relating to sea-level in feet (1 feet = 30 cm).

Elevation

Current altitude above ground in feet. Related to the location of the radio altimeter therefore it's not zero if the aircraft is on the ground.
No picture (yet), it's the next scale to the left of 'altitude'.

Elevator

 
Elevator

Pitch

Heading

 
Heading

Direction of the aircraft related to the geographical North pole.

Location

 
Location

To change the coordinates-system, go to Autopilot > Set Lat/Lon-format.

 
Rudder

Rudder

 
Speed

Airspeed

Currend speed related to the ambient air in kts (1 kts = 1.852 km/h).

 
Thrust

Thrust

G-load

Autopilot

If autopilot is activ the direction of the next waypoint is displayed as well as the next two and the last waypoint of the 'Route manger's list.
No picture (yet) and not displayed on the related pictures at all.